This Specimen has been sold.
Bargain, 2.6" Dicranurus Trilobite - Laatchana, Morocco
This is bizarre trilobite looks like something you might see in an Alien's movie. It's fittingly name Dicranurus monstrosus. While fakes of this trilobite abound, real examples like this one are fairly rare. Pretty minimal restoration, just touchups along the repaired cracks and to hide a few airscribe dings from preparation. The distinctive "rams horns" have been prepared free-standing.
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.